Mutagensis of Fusarium Oxysporum DSM 841 Enhanced the activity of xyclanase and Beta-xylanace enzymes by more than threefold. Wild-Strain spores were subjected to UV orN-methyl-N'-nitro-N-nitrosoguanidine Treatments. The Hyperxylanolytic mutant (NTG-19)secretes high level of xylanolytic enzymes on Commercial xylan as well as several agricultural residues,of which wheat brain supported maximum enzyme yields. Addition of 0.2% olive oil, an inexpensive source of fatty acids,resulted in a further 25% increase in enzyme secretion.